package com.android.sq.zouqi.util;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;

public class LvHeightHandler {
    public void setListViewHeightBasedOnChildren(ListView listView) {
           //获取ListView对应的Adapter
           ListAdapter listAdapter = listView.getAdapter();
           if (listAdapter == null) {
                  return;
           }
          
           int totalHeight = 0;
           for (int i = 0, len = listAdapter.getCount(); i < len; i++) {   //listAdapter.getCount()返回数据项的数目
                  View listItem = listAdapter.getView(i, null, listView);
                  listItem.measure(0, 0);  //计算子项View 的宽高
                  totalHeight += listItem.getMeasuredHeight();  //统计所有子项的总高度
           }
          
           ViewGroup.LayoutParams params = listView.getLayoutParams();
           params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
           //listView.getDividerHeight()获取子项间分隔符占用的高度
           //params.height最后得到整个ListView完整显示需要的高度
           listView.setLayoutParams(params);
    }
}
